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mmc: sandbox: Add support for writing

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This adds support writing to the sandbox mmc backed by an in-memory
buffer. The unit test has been updated to test reading, writing, and
erasing. I'm not sure what MMCs erase to; I picked 0, but if it's 0xFF
then that can be easily changed.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson 2021-02-05 09:38:53 -05:00 committed by Marek Vasut
parent c28d5d704d
commit 3f6fb77175
2 changed files with 51 additions and 11 deletions
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43
drivers/mmc/sandbox_mmc.c
View File

@ -17,6 +17,17 @@ struct sandbox_mmc_plat {
struct mmc mmc;
};
#define MMC_CSIZE 0
#define MMC_CMULT 8 /* 8 because the card is high-capacity */
#define MMC_BL_LEN_SHIFT 10
#define MMC_BL_LEN BIT(MMC_BL_LEN_SHIFT)
#define MMC_CAPACITY (((MMC_CSIZE + 1) << (MMC_CMULT + 2)) \
* MMC_BL_LEN) /* 1 MiB */
struct sandbox_mmc_priv {
u8 buf[MMC_CAPACITY];
};
/**
* sandbox_mmc_send_cmd() - Emulate SD commands
*
@ -26,6 +37,10 @@ struct sandbox_mmc_plat {
static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
struct mmc_data *data)
{
struct sandbox_mmc_priv *priv = dev_get_priv(dev);
struct mmc *mmc = mmc_get_mmc_dev(dev);
static ulong erase_start, erase_end;
switch (cmd->cmdidx) {
case MMC_CMD_ALL_SEND_CID:
memset(cmd->response, '\0', sizeof(cmd->response));
@ -44,8 +59,9 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
break;
case MMC_CMD_SEND_CSD:
cmd->response[0] = 0;
cmd->response[1] = 10 << 16; /* 1 << block_len */
cmd->response[2] = 0;
cmd->response[1] = (MMC_BL_LEN_SHIFT << 16) |
((MMC_CSIZE >> 16) & 0x3f);
cmd->response[2] = (MMC_CSIZE & 0xffff) << 16;
cmd->response[3] = 0;
break;
case SD_CMD_SWITCH_FUNC: {
@ -59,13 +75,27 @@ static int sandbox_mmc_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
break;
}
case MMC_CMD_READ_SINGLE_BLOCK:
memset(data->dest, '\0', data->blocksize);
break;
case MMC_CMD_READ_MULTIPLE_BLOCK:
strcpy(data->dest, "this is a test");
memcpy(data->dest, &priv->buf[cmd->cmdarg * data->blocksize],
data->blocks * data->blocksize);
break;
case MMC_CMD_WRITE_SINGLE_BLOCK:
case MMC_CMD_WRITE_MULTIPLE_BLOCK:
memcpy(&priv->buf[cmd->cmdarg * data->blocksize], data->src,
data->blocks * data->blocksize);
break;
case MMC_CMD_STOP_TRANSMISSION:
break;
case SD_CMD_ERASE_WR_BLK_START:
erase_start = cmd->cmdarg;
break;
case SD_CMD_ERASE_WR_BLK_END:
erase_end = cmd->cmdarg;
break;
case MMC_CMD_ERASE:
memset(&priv->buf[erase_start * mmc->write_bl_len], '\0',
(erase_end - erase_start + 1) * mmc->write_bl_len);
break;
case SD_CMD_APP_SEND_OP_COND:
cmd->response[0] = OCR_BUSY | OCR_HCS;
cmd->response[1] = 0;
@ -148,5 +178,6 @@ U_BOOT_DRIVER(mmc_sandbox) = {
.bind = sandbox_mmc_bind,
.unbind = sandbox_mmc_unbind,
.probe = sandbox_mmc_probe,
.plat_auto = sizeof(struct sandbox_mmc_plat),
.priv_auto = sizeof(struct sandbox_mmc_priv),
.plat_auto = sizeof(struct sandbox_mmc_plat),
};

19
test/dm/mmc.c
View File

@ -29,16 +29,25 @@ static int dm_test_mmc_blk(struct unit_test_state *uts)
{
struct udevice *dev;
struct blk_desc *dev_desc;
char cmp[1024];
int i;
char write[1024], read[1024];
ut_assertok(uclass_get_device(UCLASS_MMC, 0, &dev));
ut_assertok(blk_get_device_by_str("mmc", "0", &dev_desc));
/* Read a few blocks and look for the string we expect */
/* Write a few blocks and verify that we get the same data back */
ut_asserteq(512, dev_desc->blksz);
memset(cmp, '\0', sizeof(cmp));
ut_asserteq(2, blk_dread(dev_desc, 0, 2, cmp));
ut_assertok(strcmp(cmp, "this is a test"));
for (i = 0; i < sizeof(write); i++)
write[i] = i;
ut_asserteq(2, blk_dwrite(dev_desc, 0, 2, write));
ut_asserteq(2, blk_dread(dev_desc, 0, 2, read));
ut_asserteq_mem(write, read, sizeof(write));
/* Now erase them */
memset(write, '\0', sizeof(write));
ut_asserteq(2, blk_derase(dev_desc, 0, 2));
ut_asserteq(2, blk_dread(dev_desc, 0, 2, read));
ut_asserteq_mem(write, read, sizeof(write));
return 0;
}